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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2361a8e5e9edf2c7de2a5bd9a4989aa8d177f27408c52618a44867865cff9d36' 
  AND token = 'HDIiNyE+EODib7xGfolsyDE8vRm72F/CCYWsRnTRBY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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