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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa178d07675b8785011f98a802a77285b66fe09e27d3ddbd0a6ad80ce03e30a' 
  AND token = '9t3QBfHfziW8UnxNq4RuD6Mk0ieHZMEOGeLVA+HKuL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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