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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813db5af4e6f28a2842d105c4ad08c6dff97d9298881decbab0aecd0dd312637' 
  AND token = 'EdbF4+/1lGJqJb6yYtiywXMw9gPWLaCz3fMdNUkXskI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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