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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe64ea4b4f561475ddf3c24666e4fae54f89da7be6b329a5265e32d7bb3c9cf5' 
  AND token = '3Z/2bRG0D7TNGDRUXzlPp+JXvpsY5D+eldD3WA6AsRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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