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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ff0f909195dccc65b841510c9af9361d44b31b288d4716f43b9092bea40eb3' 
  AND token = 'gNZ2/WJIU8P8Ao8P85xNkHzJMVss7dysIvI4V5Asa2k=' 
  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"
    }
  }
}