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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd103e875f717b301d1a6c2b7fbd0315417aa87f20ff087453f4be1c393d30035' 
  AND token = 'Hp64/SY7ZYUeFO+b+4/WObALYHCWRyXsvMNKhD7lHq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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