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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3268a65c53f7c2990cbff5070274e7b6afc1c0f6a254d8ea2978a1b9c8f10827' 
  AND token = 'F5SVR7w62UaSDemNyIH2pudh7JL6fFLAnUYJHTEeL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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