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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be77a7b8ac7c6edc624bd35abd1e95c92112003d867174cbb8e131f77197867' 
  AND token = 'WSW7K/eGOPxRu2Q5pHv5s8duWHj/18/mERBAwQ6JeAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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