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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46b119fc3dcac0b28d3b36b057e7c54e120465088c89746baab918c426b3d68' 
  AND token = 'RYBFpVHL9LEvLviBF8vTqDOVTaciTuEbZf31T9Hak7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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