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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c982f77c60ad53a2659096085a74abcba06e5eba180f41d7da7c837dc4cdc6' 
  AND token = 'IiqS0fBeI6+Y6nW+q/Psr5x++jHofXgNX6ipCqrhQVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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