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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42200a002f57050fd43454077ffcf549627e72d67e517da17b07cdb49f83769a' 
  AND token = '9jjTFYZEjPeKoX3wRGM054hs/tgQcQeJ6qcjqn4J7UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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