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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f5862d8462f204eb2ca434e0bec4ca086cc4d8e227cfaa98584ea394e3c5c7' 
  AND token = 'y3+jOn9Iu/TC8M1K2M9y8aC0l/VFC8pCkabn6/9NOi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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