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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d94490a16be70ab0f65b2f948169063957e73f59e874c1d2608e515ae5c429' 
  AND token = 'sSf1ZybAxolKq4a4Q0zXwabwA40uEdyYPpBQvxHskbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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