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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5da9302d64477a73e1b889b6e720e24076d0666b7b78bb792320a7e46e22505' 
  AND token = '//Y+xb7Xt+moHCoZbLAu6sxpeUQn2HxON/ipY6epRNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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