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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663558ed139a8991545c00362b0ff8a3db9d74a3c2f529a634b1d2d3c0c883ee' 
  AND token = '6QO9a1vvnx0QIsnoOMyPFYvgFEDFS8chRMjBeMLWnao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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