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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ae7b860087a09752977b34abeb52e15e0eee8762730110164abc2b2c13d887' 
  AND token = 'Ylc5FCJBoGgsCgzJS1IKTDYxyz8gk1hiuZYrV/6jG8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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