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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfafb170ef6789b0b21872a4c6dd3ac07f51409bd8e0d2532b44edf86502554' 
  AND token = 'NkOcC+jXECUKfk4SGDzaN/upHCX6l9s/KKI0u5d/CPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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