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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96a823b0ccecf0efc1bd7db260f0f9acd1e426332e15235dde3ecc9d9e82b76' 
  AND token = 'i0G1pnwydtJ3ZlUadPlQTBnS0q8ETB1UDSQWC6hnfX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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