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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b9a30a815260ebe6193835792e210cf6d8316b51fe737bb50e20b1fd99bce1' 
  AND token = 'oHokFIgcVBGnN/fadaW1so/x+BGoe6pOLodGuaK/l5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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