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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bb6ce74c1390fb1f9e2f3b02713cd98ee940c1a83f3cfb55676d8b47fab69c' 
  AND token = '6V9YmBoGx7j0jen54ixJgzEVJ/7ReLhYTGczirbt2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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