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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2785e959d94434f2c72b42969fd940f6c6f0bed816b43f1b29525a5e6a2a51b1' 
  AND token = 'E1dA3Ie0KysMIV9MbLYxKR3OLi3/U43P5qZeNNUdSaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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