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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ad24033dc98ef8c56d16f0979b9627279408059abbd117e2b36694ae37e63' 
  AND token = 'FWv1DZPZaB1t8jB037XjFRF4eFj59fQHRiW9afBo4Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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