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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333e7885adefa31d26849d59f1e84004c27e82de84892bfc780c6b11ed45f9a1' 
  AND token = 'A3yy+VbjnmZJGhe3TxkQn0U/fGLcc7l+4FKTT67Dtdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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