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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c7b85d9d55c6ecd7783b5cbf6f2d0367bf51691da56bdc253bdcb3d5678512' 
  AND token = '0S/ThjBwZ5OpS29tBaCxbXyAwwHTWC3ZjIEiktztwkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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