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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0df5f5ae1ccf7bbed33502da1aa67390d52bc5e48dfb5c8a2c96e01b9da078b' 
  AND token = 'VB0/KIzk9JENHjH2tUGS94AwTo61k4H122sP/5cYzfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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