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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026958a7fcf14eb0c9b72ed34ae4a2ae5b3432bdc3e3b0f07d5dd5cc77d2c407' 
  AND token = '7ZJZD2UoFbrKveq2UEdl+BR7geb1asIENrGZOhgUMdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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