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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c98d9a4d4eccf0f864b89e4e9c22e13a0bb1c066a9d22226fdf6a787abd0ff' 
  AND token = 'UNEiWm5IHdiSOcMY7EzF8TjrXscdlfCLi3lhTuhVlE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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