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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d698a8f55b062123982671763bb73da2a1d0548667229bfc4cf001bd1b602e' 
  AND token = '0tV5ENHOvZCRNjH4cksOpv2njnLCxFgSYt3lg3d9xaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}