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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe89ac01553bd2434a4cf480b20567364ee62c5d25e06a810e88fff827e2449' 
  AND token = 'TZi3Z4DYaXVqWSR8VbDl6I9I5mAaTQI0SB8U2GoSQxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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