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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e1968b4e30a09d4ca3f61bf7ab4927888a63a5977dbfb3f79aacea0e8338d5' 
  AND token = 'bA89AxGP5F6eCyktoQXZ3GHG+d8DGHlcn9EzFsgjBhU=' 
  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"
    }
  }
}