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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584a5ec78fcf3f577c71de9917242ee09b8d066808c80b1ecfec5cea5a6af8be' 
  AND token = 'rkWefqMxiYOeHRL3wsJSd+mYFFUY688VoFEX0ziRk7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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