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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7780a0007c92942338a43ec869f0cf69b58d3dc2d17ed06adc3917ddb9445fa5' 
  AND token = 'cM6IXaCETb4SN1ii0BpjUS9EJ28c55yG/rQMrGs35e4=' 
  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"
    }
  }
}