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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9639fbfac52ecf1c55d73b706bb0cd3bf7c5346d23fbd0d0f23d24d2e135a444' 
  AND token = 'u/7ZdYpujIUbqx1m/S3DgRZxliDQ0nTUXSihNLi1DEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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