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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6e997c1da85585155abd725adec188c91dfefb92b287d47bd14abb71577e6f' 
  AND token = 'DnRM2FZSGBismgjAo1lO4OzVpk1Ya7lZMQADV7BebLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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