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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd1d9dcd9a5b1faa777433f916fea9af1be71b92bb207696d58dbbc0137083f' 
  AND token = 'mOOPS+MRt2+OySjvLXxD5N4xvsBKaO3FxtFsMtl+bkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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