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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357f576bc1bcb400879579da61bc23794ba8c48478f4586452e241a66110c962' 
  AND token = 'Dspi9aSggZBXG5FBFoG+UhrW+/2h9I+QQRAtN2FN1rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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