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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab7f8fc0e23bec986785df9643c6a04369d9e09b6f1c34650194c6f484ffba8' 
  AND token = 'ogcSKi3gzLk/x4RfjwHOeWCXpNwXNNHqRS6ejCR3fIM=' 
  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"
    }
  }
}