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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510d2467d6543668f51cafbe5a74fe2b93b41a2344fd1a790fbf4be1cc45e509' 
  AND token = '6PBjSbwIn8MpO9X/gWSsVxn7HTki3Bb6/reVBiOhc9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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