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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ec28e09b2a5ff312e8a72b327c66867bbeee453cd92a1d67f0f14b6194076c' 
  AND token = 'A0wDdjmaC0Roy0C+yKFJk2hdSCTGfZzvd3IdQAlXSd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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