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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce8bf78568bfec0373f5bc57ec07e079ac5ee3ebf3ebe099fad7d7543d1c73c' 
  AND token = '4Czd9gW6Bqup5npG7TO38PXNP6dBDd/wXRp/tunLjFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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