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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878d3ad88a2fc98ddfc01fcc4bf404f7e2628565002d9f35d8cb75f65f7ddb31' 
  AND token = 's5IYmgrd1Q3DrcL1let7z286SQRPyioB7SEj37Li24k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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