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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da324fead570c30260c75fbb6d75c196325a12d7955b2cf22e351be4c06fd665' 
  AND token = '6Erv0NVEBISXoJcy0iK2xj7NTFVheGNrXnqv8YS/lxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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