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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4c19e9a7341d9fbf366ae34c30fdf65e10fd1b1168b23e5882c337c5e5f97b' 
  AND token = 'seUkScGW2gFxZ51JcsKaGiD0LBm5pCTch7KExwO54Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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