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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4c97047100e0c63611e90643440fae19d61650e7469e50c048742e615267b6' 
  AND token = 'OBpLJt2O/JJI327Zf7JZbQ5Csa2PYK4r6B0w27g7u0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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