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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d03e5692b2dd79bcf8fa22ec5a5cc968f083aa2d136eed2dadab05386123bf' 
  AND token = 'fCvbsuXilvYN2itewqJqhAiBO7jKrb++uN2b37/wbjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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