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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfc758fa71204586f76f6f1e22bd58c5fad1ad0da4b1051f3303d38ae3cfd81' 
  AND token = 'hkybUdeDzgtTWEHWwxGelofwD+Z9L9YsegSEkZNpS1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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