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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a08163a1ea5cc35ddd179ee54267f53e484d164ad8552ec5f9b5a63629c02f8' 
  AND token = 'eCUVVv5rw38siPAah0r2bwPwDhls5VLSnUs7kSXu6gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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