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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33536833e900331d4f7e11c61b2297020e7d37df2a6d5b60fe548f3b544b6cf' 
  AND token = 'NOhvtHBn5+xFhUn6/ySO5kKdK+Y8bQS4Cn9uOn9KkQA=' 
  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"
    }
  }
}