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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b7f350acc977eddcfe611c2dedfe4b012eb8bb0c5197fdf93b2196f89bdcff' 
  AND token = 'X2VaJC0ve/HgL+h7Fwll0b/pLi8olOTv+pVONlUCVY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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