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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d9bbd2282ca845042ab4175afcb47731ad245376c7c91cf5478691159ec400' 
  AND token = '8kjpmpt+HzlUrXpABSiDtfAjouq4TyZZ/MOg0ql7RZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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