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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50fd7682f1a5625e6f6b73c827bea62409be3ad95c70a37e1336d24fbdb713f2' 
  AND token = 'FxU57Hesa3PphDiG+KK1hXgNkXF+Ou4m2sA1HEkj408=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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