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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6f853a8d58bfb52ca18fc59ca4368e7df19daa2300a89bc4c6d01435743b88' 
  AND token = '4X0C46TFoOIzirE+arYlv/uTJoM34StG7tEUPcRFpkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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