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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ca9863f9508ad4959ff54ead467d3eca005cc211ae93cfc9cf4993c8b6ca5c' 
  AND token = 'GcvJBDzRVbKoVPHpcNw2XsXb6nJ7gTV8eBtpJEE0MQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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