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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e21f2413beeda2432c721e5f8b04e3bfbcdffd6fa412e0a96d4814d2cfd2080' 
  AND token = 'XpLNLSDZwJb6jdnkMVW/kOFJioJ4xQUlXz/eqyveWtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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